...police them more ...black people commit more crime
Not so much they "commit more crime" but there is somebody around who's job it is to find a way to charge somebody for any type of "crime."
Refuse to talk to a police officer when you're not doing anything wrong? That's a crime. Walking down the street in your own neighborhood without a photo ID? If a cop asks you to produce an ID and you refuse (because you don't have it on you)... that's a crime! Music loud? CRIME! Large group of people having a good time in the front yard? TURBO CRIME! Messy lawn? Grass to tall? CALL IN THE SWAT TEAM THERE'S JUST TOO MUCH CRIME!
When somebody is always watching you and their sole job is to be the arbiter of what is and what isn't "crime" the longer they watch you the more "crime" you will be found engaging in.